Greenland poet Aka Niviana’s way of life is disappearing as her country thaws, while the subsequent meltwater threatens Kathy Jetnil-Kijiner and her fellow Marshall Islanders thousands of miles away. Their joint trip to the melting glaciers inspired a climate call to arms

Hurricane Harvey, Hurricane Irma, flash fires, droughts: all of them tell us one thing – we need to stand up to the fossil fuel industry and fast, says Bill McKibben, a writer and the founder of the climate campaign 350.org